Novel Oxadiazole-Containing Polyfluorene with Efficient Blue Electroluminescence
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- 作者：Fang-Iy Wu ; D. Sahadeva Reddy ; Ching-Fong Shu ; Michelle S. Liu ; and Alex K-Y. Jen
- 刊名：Chemistry of Materials
- 出版年：2003
- 出版时间：January 14, 2003
- 年：2003
- 卷：15
- 期：1
- 页码：269 - 274
- 全文大小：105K
- 年卷期：v.15,no.1(January 14, 2003)
- ISSN：1520-5002
文摘
A novel oxdiazole-containing polyfluorene copolymer (PF-OXD) was synthesized byattaching two electron-deficient, 4-tert-butylphenyl-1,3,4-oxadiazole groups onto the C-9position of the alternating fluorene unit to form a 3-D cardo-structure. This polymer possessesa very high glass transition temperature (Tg: 213 
C) and very good thermal stability dueto its rigid cardo-linkage. The results from the photoluminescence measurements of theisothermally heated PF-OXD thin film (150 C for 20 h) show that the commonly observedaggregate/excimer formation in polyfluorenes is very effectively suppressed in this polymerdue to its 3-D structure and high Tg. A double-layer LED device using this polymer as theemitting layer shows a bright blue emission with a low turn-on voltage at 5.3 V and a highbrightness of 2770 cd/m2 at a drive voltage of 10.8 V. The maximum external quantumefficiency is 0.52% at 537 cd/m2 with a bias of 7.4 V. The improved device performance overthat of poly(9,9-dioctylfluorene) (POF) may be due to better electron injection and transportin PF-OXD and the efficient energy transfer from the OXD side chain to the polyfluorenemain chains.
C) and very good thermal stability dueto its rigid cardo-linkage. The results from the photoluminescence measurements of theisothermally heated PF-OXD thin film (150 C for 20 h) show that the commonly observedaggregate/excimer formation in polyfluorenes is very effectively suppressed in this polymerdue to its 3-D structure and high Tg. A double-layer LED device using this polymer as theemitting layer shows a bright blue emission with a low turn-on voltage at 5.3 V and a highbrightness of 2770 cd/m2 at a drive voltage of 10.8 V. The maximum external quantumefficiency is 0.52% at 537 cd/m2 with a bias of 7.4 V. The improved device performance overthat of poly(9,9-dioctylfluorene) (POF) may be due to better electron injection and transportin PF-OXD and the efficient energy transfer from the OXD side chain to the polyfluorenemain chains.